mirror of https://github.com/axmolengine/axmol.git
100 lines
2.8 KiB
C++
100 lines
2.8 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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* vim: set ts=8 sw=4 et tw=99 ft=cpp:
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef jsalloc_h_
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#define jsalloc_h_
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#include "jsutil.h"
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namespace js {
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/*
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* Allocation policies. These model the concept:
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* - public copy constructor, assignment, destructor
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* - void *malloc_(size_t)
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* Responsible for OOM reporting on NULL return value.
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* - void *calloc_(size_t)
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* Responsible for OOM reporting on NULL return value.
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* - void *realloc_(size_t)
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* Responsible for OOM reporting on NULL return value.
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* The *used* bytes of the previous buffer is passed in
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* (rather than the old allocation size), in addition to
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* the *new* allocation size requested.
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* - void free_(void *)
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* - reportAllocOverflow()
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* Called on overflow before the container returns NULL.
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*/
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/* Policy for using system memory functions and doing no error reporting. */
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class SystemAllocPolicy
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{
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public:
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void *malloc_(size_t bytes) { return js_malloc(bytes); }
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void *calloc_(size_t bytes) { return js_calloc(bytes); }
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void *realloc_(void *p, size_t oldBytes, size_t bytes) { return js_realloc(p, bytes); }
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void free_(void *p) { js_free(p); }
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void reportAllocOverflow() const {}
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};
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/*
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* Allocation policy that calls the system memory functions and reports errors
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* to the context. Since the JSContext given on construction is stored for
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* the lifetime of the container, this policy may only be used for containers
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* whose lifetime is a shorter than the given JSContext.
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*
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* FIXME bug 647103 - rewrite this in terms of temporary allocation functions,
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* not the system ones.
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*/
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class TempAllocPolicy
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{
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JSContext *const cx;
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/*
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* Non-inline helper to call JSRuntime::onOutOfMemory with minimal
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* code bloat.
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*/
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JS_FRIEND_API(void *) onOutOfMemory(void *p, size_t nbytes);
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public:
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TempAllocPolicy(JSContext *cx) : cx(cx) {}
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JSContext *context() const {
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return cx;
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}
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void *malloc_(size_t bytes) {
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void *p = js_malloc(bytes);
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if (JS_UNLIKELY(!p))
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p = onOutOfMemory(NULL, bytes);
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return p;
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}
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void *calloc_(size_t bytes) {
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void *p = js_calloc(bytes);
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if (JS_UNLIKELY(!p))
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p = onOutOfMemory(NULL, bytes);
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return p;
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}
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void *realloc_(void *p, size_t oldBytes, size_t bytes) {
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void *p2 = js_realloc(p, bytes);
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if (JS_UNLIKELY(!p2))
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p2 = onOutOfMemory(p2, bytes);
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return p2;
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}
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void free_(void *p) {
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js_free(p);
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}
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JS_FRIEND_API(void) reportAllocOverflow() const;
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};
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} /* namespace js */
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#endif /* jsalloc_h_ */
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